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The familiar sounds of your heart are made by the heart's valves as they open and close.
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The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.